The teacher tells us that ______ careful we are, ______ mistakes we will make.
A:the more; the fewer
B:the fewer; the more
C:the more; the more
D:the less; the fewer
下列各点中位于东半球的是( )
下面是光学显微镜观察植物叶表皮气孔时的几个操作步骤。要把显微镜视野下的图像从下图中的甲转为乙,规范的操作步骤是①移动载玻片 ②调节光圈和反光镜③转动转换器 ④转动细准焦螺旋⑤转动粗准焦螺旋